Gene, Why use 12 or 24 volt motors when 5volt or less are readily available? These lower voltage ones are often used for simple PIC projects or in toys and would give less problems as an input for the comparators. Presumably you could protect the inputs by putting a pair of zener diodes back to back across the chip's input but I may be wrong here - I'm no electronics expert!!!
Ian __________________ Ian W. Wright Sheffield UK On 30/08/2010 04:57, Gene Heskett wrote: > A thought that I have played with in my mind, and gone as > far as to order a > few parts, is to use a more or less std small stepper motor with 12 or 24 > volt rated coils, as an encoder by feeding it to a pair of comparators > which should give a quadrature A& B output. I haven't worked out a 100% > reliable method of protecting the comparator inputs from the over-voltage a > fast spin of the knob on the motor shaft would feed them, nor have I worked > out the most reliable hysteresis feedback to prevent low level vibrations > and such from outputting spurious signals. > ------------------------------------------------------------------------------ Sell apps to millions through the Intel(R) Atom(Tm) Developer Program Be part of this innovative community and reach millions of netbook users worldwide. Take advantage of special opportunities to increase revenue and speed time-to-market. Join now, and jumpstart your future. http://p.sf.net/sfu/intel-atom-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
